共查询到20条相似文献,搜索用时 62 毫秒
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在探讨智能体模型与GIS集成方法的基础上,以昆明市艾滋病传播为例,采用GIS中嵌入模型的集成方式,将利用Java开发艾滋病智能体模型与利用COM开发的GIS系统通过桥接的方式进行集成。结果表明,利用桥接的方式可以很好地实现智能体模型与GIS的集成,实现了GIS对动态地理现象的分析处理能力。 相似文献
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分布式GIS分层体系结构模型的研究 总被引:12,自引:0,他引:12
提出了一个通用的分布式GIS的分层体系结构模型;用户界面层、应用层、应用接口层和数据服务层,给出了该模型的思想和主要特征,并结合Internet/Intranet环境讨论了模型的实现方法。分层分布式GIS模型的提出可以部分地解决现有的Internet/Intranet GIS存在的问题。 相似文献
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GIS中的应用模型可分为测量模型与地理模型两种。测量模型是基础,是表象,而地理模型是核心、是本质。本文立足对二者之间的比较,地GIS的脑海与 作了进一步的探讨。 相似文献
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获取高精度DEM是分布式水文模型开发和应用的基础,而最新发布的全球高分辨率SRTM数据在很大程度上解决了高分辨率DEM数据获取相对困难的问题,对于水文学研究具有重要意义。由于利用雷达技术获取地面高程数据技术本身的限制,SRTM原始DEM数据中存在着很多问题。本文以雪野水库区域为例,利用ASTER数据通过分析两种数据高程差异的分布特点对SRTM高程数据无效区域进行了填充,计算结果表明该方法可以提高无效数据处理结果的精度,是一种有效的获取相对完整地形数据的方法。 相似文献
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Spatio-temporal GIS data model based on event semantics 总被引:3,自引:0,他引:3
XUZhihong BIANFuling 《地球空间信息科学学报》2003,6(3):43-47
There are mainly four kinds of models to record and deal with historical information. By taking them as reference, the spatio-temporal model based on event semantics is pro-posed. In this model, according to the way for describing an event, all the in-formation are divided into five do-mains. This paper describes the model by using the land parcel change in the cadastral information system, and ex-pounds the model by using five tables corresponding to the five domains.With the aid of this model, seven ex-amples are given on historical query,trace back and recurrence. This model can be implemented either in the ex-tended relational database or in the ob-ject-oriented database. 相似文献
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There are mainly four kinds of models to record and deal with historical information. By taking them as reference, the spatio-temporal model based on event semantics is proposed. In this model, according to the way for describing an event, all the information are divided into five domains. This paper describes the model by using the land parcel change in the cadastral information system, and expounds the model by using five tables corresponding to the five domains. With the aid of this model, seven examples are given on historical query, trace back and recurrence. This model can be implemented either in the extended relational database or in the object-oriented database. 相似文献
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GIS中三维空间数据模型的集成与应用 总被引:1,自引:0,他引:1
针对三维地理信息系统中的三维空间数据模型,结合城市规划工作,分析讨论了三维数据模型集成的必要性以及TIN与CSG、八叉树与TEN、矢量与栅格等混合数据模型实现的方法和思路,提出了在城市规划应用中模型集成的适用类型及有关要求. 相似文献
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Shi Wenzhong 《地球空间信息科学学报》2013,16(2):6-12
This paper presents a hybrid model for three-dimensional Geographical Information Systems which is an integration of surface- and volume-based models. The Triangulated Irregular Network (TIN) and octree models are integrated in this hybrid models. The TIN model works as a surface-based model which mainly serves for surface presentation and visualization. On the other hand, the octree encoding supports volumetric analysis. The designed data structure brings a major advantage in the three-dimensional selective retrieval. This technique increases the efficiency of three-dimensional data operation. 相似文献
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Development of a hybrid model for three-dimensional GIS 总被引:10,自引:0,他引:10
SHI Wenzhong 《地球空间信息科学学报》2000,3(2):6-12
1 IntroductionThree_dimensional (3_D)GeographicalInforma tionSystems (GISs)areveryimportantfortheap plicationfieldssuchasurbanplanningandmanage ment ,geologicalsubsurfacemodeling ,miningandoilexploration .Ina 3_DGIS ,anobjectcanbede scribedinhorizontal (x ,y)andv… 相似文献
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DEM分辨率对小流域地形水文特征提取的影响 总被引:1,自引:0,他引:1
基于ArcGIS水文分析工具研究DEM分辨率对提取流域地形和水文参数的影响,选择黄土丘陵沟壑区典型小流域—韭园沟流域为实验区,该流域地形复杂,沟壑纵横,DEM分辨率变化对其地形表达有很大影响。研究表明,DEM分辨率对小流域面积、流域高程、坡向的表达或提取精度影响较小,而对坡度、河道长度、河网密度和河道分级等因子提取有较大影响。 相似文献
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Symbol portrayal is an important function of GIS.Sharing symbolic information in different GIS platforms is necessary for GIS applications and users.This paper discusses the necessity,possibility and solution technique of sharing a symbol library in different GIS platforms.The route map is designed as follows:first,to set up a general data model for the symbol library,then to design a standard exchange format,and finally to call on the GIS manufacturer to provide the interchange tools for their symbol libra... 相似文献